SIMPLIFIED INSTRUCTIONS
AUTO OFF: Removes power after 30-45 minutes; only when battery
operated. Auto off defeated when operated from external power.
TO RESET: switch "Off" then back to desired range.
FREQUENCY MEASUREMENT: 1. Insure "Read" button is out. 2. Select
range and signal connection, using guide below. 3. Read frequency on
LCD.
1 Meg/Probe	50 ohm/Probe	Pickup Loop	
Signal	Direct	ISO	Direct	50/1 Megohm	
Audio					
Digital Pulse			•	(ECL)		
Digital Sq. Wave			•	(ECL)		
RF Oscillators					
Transmitter Outputs					
SENSITIVITY: Leave "Sensitivity" at "Max" for most signals. Reduce if
necessary to obtain stable reading on noisy signals.
GATE TIME: Use fast "Gate Time" for fast display update. Use "Slow Gate
Time" for maximum resolution.
RATIO: 1. Connect to first frequency. 2. Press "Store" button until -"
moves through display. 3. Connect to second frequency. 4. Press "Read"
button. Display shows ratio of frequencies:	2nd frequency smaller
than 1st, " x " = 2nd frequency is larger than 1st. 5. Push "Store" button
with "Read" button locked-in to recall 1st frequency.
CRYSTAL: 1. Set function switch to "Crystal". 2. Insert crystal into
"Crystal Check" socket. 3. Display is approximate fundamental frequency.
Exact crystal frequency varies with circuit.
TEMPERATURE RANGE: No warm-up time is needed. Accuracy over
temperature is:
2.0 ppml 1 ppm
0.5 ppm
1.0
ppm
- 250C - 100C 0°C
40°C 50°C
SPECIAL DISPLAY FUNCTIONS:
"FC" - Battery is 75% or more of full
charge.
"LO" - Battery is 25% or less of full
charge (unit shuts off if voltage too
low for reliable operation)
"FUSE Bad" : Internal 50 ohm input
protection fuse is open. Check for
excessive level before replacing fuse.
Fuse Replacement: 1. Remove case by
removing 4 screws, 2 on each side.
2. Replace fuse with spare. (see
diagram) 3. Replace case and screws.
BATTERY
Spare
Fuse
50 Ohm
 
Fuse
66K258